Means for securing blades in shearing-machines.



E. H. CARROLL.

MEANS FOR SECURING BLADES lN SHEARING MACHINES.

v APPLICATION FILED Nov,21.1912.

1,146,475. Patented July 13, 1915.

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T NTTED STATES PATENT @FFTQE ELIBERT H. CARROLL, or woacns'rna, MAssAcHUSErrs, ASSIGNOR T0 MORGAN CONSTRUCTION COMPANY, or wononsrna, MASSACHUSETTS, A conrona- TION OF-MASSACHUSETTS.

MEANS FOR SECURING BLADES I1\T SHEARING-MACHINES.

Specification of Letters Patent.

Patented July 13, 1915.

AppIication filed November 27, 1912. Serial No. 733,731.

To all whom it may concern Be it known that LELBERT H. CARROLL, a citizen of the United States, residing at Worcester, in the county of Worcester and Commonwealth of Massachusetts, have invented a new and useful Improvement in Means for Securing Blades in Shearing- Machines, of which the following, together with the accompanying drawing, is a specification.

My invention relates to shearing machines and more particularly to improved means for securing a shear blade in operative position in a machine of that class! An object of the invention is to secure a shear blade inoperative position by means so constructed and arranged that the blade may be very easily and quickly removed from the machine.

Another object of the invention is to provide means for securing a shear blade in position, not only in the line of relative motion of the blades, but which shall at the same time resist lateral thrust such as might be exerted by another blade.

Further advantages will be apparent from the following description in connection with the accompanying drawing showing one embodiment thereof, and in which Figure 1 is a partial view of a shearing machine looking toward the ends of the blades, the machine being of a type suitable for cutting metal bars; Fig. 2 is a view of the same portion of the machine shown in Fig. 1, but looking toward the sides of the blades; and Fig. 3 is a view similar to Fig. 1 except that a portion of the View is in section on the line 33 of Fig. 2.

Similar reference characters refer to similar parts in the different figures.

1 The machine shown in the drawing is of a type commonly used for cutting metal bars and rods and includes two cooperating shear blades 1 and 2. The upper blade 1 is mounted in any suitable manner upon a reciproeating plunger 8, the plunger being operated by any suitable means to cause the blades to open and close. The principle of my invention is disclosed in the means shown for mounting the lower blade 2. This blade 2 is secured by bolts 1 to a block or support 5, which is recessed along one edge to fit the blade and afford a proper support therefor. The block 5 has on its lower face a longitudinal rib 6 and a transverse rib 7, both rectangular in cross section, and these ribs fit in corresponding grooves shaped to fit and receive the ribs and formed in the upper surface of a base 8 of the machine. It is clear that these ribs and grooves will cooperate to resist effectively all forces tending to produce lateral or longitudinal movement of the block 5 and blade 2. It is customary to provide, in ma chines of this type, a support for the lower blade similar to the block 5, but such sup- .port has been previously secured to its seat by bolts passing directly down into the base of the machine. In accordance with my invention, I secure the block 5 to its seat by bolts 9, which are placed at substantially right angles to a plane extending from the cutting edge of the lower shear blade 2 to an axial line about which the shearing strain tends to impart a rotative moment,

which becomes considerable when the cutting corner of the lower shear blade becomes rounded by continued use. The axial line, in the present instance, is located at the contact of the base 8 with the rear edge of the block 5. By placing the bolts 9 at substantially right angles to the broken line 9, indicating the plane connecting the corner of the blade 2 and the rear corner of the block 5, the maximum resistance is exerted to the rotative moment of the block 5 and the latter is securely held from being lifted from the base 8. In other words, the pressure of the movable blade 1 during the shearing operation tending to rock the blade 2 and support 5 upon the frame, is exerted through a lever arm coinciding in length and direction with the line 9 and the bolts 9 are so disposed as to exert the maximum resistance to this turning movement. The bolts 9 are headed at their upper ends and are secured in position by driving small wedges 10 through transverse openings in their lower ends.

To facilitate removal of the block 5 with the lower blade 2, the openings provided for the bolts 9 in the base of the machine are extended laterally forming slots 9', obviating the necessity of withdrawing the bolts 9 longitudinally to remove them, it being necessary only to remove the wedges 10 and lift the bolts out of the slots 9 in removing the block 5 and blade 2.

I do not Wish to be limited to the exact details of construction shown and described, as various changes may be made within the scope of the appended claims Without departing from the spirit of the invention; but

Having described my invention, What I claim as new and desire to secure by Letters Patent is:

l. A shear including a pair of cooperat ing blades, a support upon which one of the blades is mounted, and a bolt securing said support to the frame of the shear, said bolt extending at an oblique angle to the line of motion of the movable blade.

2. A shear including a pair of cooperating blades, and means for securing one of said blades to the frame of the shear, comprising a bolt extending at an oblique angle to the line of motion of the movable blade.

3. A shear including a pair of cooperating blades, and means for securing one of said blades to the frame of the shear, com prising a bolt extending substantially at right angles to a plane coincident with the lever arm through which the strain of the cutting operation is exerted, to rock said blade about said frame.

4. A shear including a pair of cooperating blades, a member upon which one of said blades is mounted, said member having an extended supporting' surface upon the frame of the machine, and a bolt securing said support to said frame, said bolt exte m tending'substantially at right angles to a line-connecting the edge of said blade With the remote edge of said supporting surface.

5. A shear including a pair of cooperating blades, a member carrying one of said blades at its end, and having an extended supporting surface upon the frame of the shear, and a bolt securing said member to the frame, said bolt extending substantially at right angles to the plane connecting the edge of said blade ith the remote edge of said supporting surface s 6. A shear including a pair of cooperating blades, a support upon Which one of the blades is mounted, the support and the frame of the shear having a rib and groove connectiomand a bolt attaching said support to said frame and extending at an oblique angle to the ribbed and grooved surfaces.

7. In a shear of the class described, 00111 prising a pair of cooperating blades, a base, a block supported on said base, a shear blade attached to said block, and a bolt attaching said block to saidbase, ith the axis of said bolt at substantially right angles to a plane including the cutting edge of the shear blade and the axis about which the rotative moment of shearing is exerted.

Dated this 22nd day of November, 1912.

ELBERT H. CARROLL.

Witnesses: V

PENELOP GOMBERBAQl-I, NELLIE WHALEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.. 

